Final answer:
The question is about acid-base titrations and pH indicators in Chemistry. Solutions with a pH less than 7 are acidic, and those with a pH more than 7 are basic, while a pH of 7 is neutral. Indicators like methyl red and phenolphthalein are chosen based on the expected pH range of the titration.
Step-by-step explanation:
The subject of this question is Chemistry, specifically related to acid-base titrations and indicators. In titrations, the amount of a base (like NaOH) is gradually added to an acid until the solution becomes neutralized. The pH of a solution is a measure of its acidity or basicity. The pH scale ranges from 0 to 14, with 7 being neutral. If the pH is less than 7, the solution is acidic, and if it's more than 7, it's basic.
According to the provided data:
- Milk of magnesia is basic because it has a pH of 10.5.
- Pure water is neutral with a pH of 7.
- Wine is acidic with a pH of 3.0.
Regarding the selection of indicators:
- If the pH of the solution is between 4.95 and 6, methyl red should be used as the indicator.
- If the pH is between 8.2 and 10, phenolphthalein should be used as the indicator.
In titration graphs, the pH changes gradually until it reaches a point where it increases or decreases sharply. This point is known as the equivalence point, where equal amounts of acid and base have been combined.